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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1859628f3859d1f8a70c05cc86b0391623eb259400c9d2c299a971ec4764c3' 
  AND token = 'h5JUIc6rmmD9sGC/Ku74IbaBQjiaITbe7BepygfrtbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}