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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e62a2fa98cbbdfe6019975b42bab1cdf3739e04f8fcdb9a30e1de216229f07b' 
  AND token = 'le052kXadPNShqYrmpDsOkqpwE8M337D3jYQTmxWTaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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