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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfc0abeccf703f02c6b62ef58e70f9fd1b250d05c143dbafe9f6f1d778470fe' 
  AND token = '6GhsBkhp3EwqWc3gDArUx3T/LirNSQR3Ar5F76aaBLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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