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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d744a4bc19333fc59c0a6692b259d3796c86907da132e050b1d94a8e758226' 
  AND token = '/h3q9xR08TLpM4I8egDk+4Ka2HPymXomDTadzCwrvhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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