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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b494624b0a5c22809f8991d1cc3a4c91d065ec58845629cbe19aacc1f70aefa' 
  AND token = 'nTCi6vEZV0p78v8k3U0uVyrY7M1pG5AevzI2aMhloeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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