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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20912320e7d141bafbd1c10ecd31d67b0ad091b433e9f4dca25e181c28304fcb' 
  AND token = 'qxN+AcrXNanh51Ejis2N0xzGyOIW83uCvj+3Jb7TjQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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