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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ef4852ed154b94eb35e743928f53dcb3a415b2d3c456f64f3f2993fdbe2748' 
  AND token = '5HNjSMAn2+1O5Z8pNR+hAu7L4AQ5anxK8XS9/mucAH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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