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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9bf904031f12c4fad3e93e53fcae1c14b27208a868ebb0a098452bc1fbac8c' 
  AND token = '6E8UsTAK463PhYCGSyOBcZEmbOqKIe8hPWAY3vKmjaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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