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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dacedcb3f3216759996a7a1a690e9ce441d8918dd3a7d683a61ffc1ff4c8bf2' 
  AND token = 'MQPohaD3mbke/uV3IhJkNRbHtAAvwzk+S7w2tn1YqXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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