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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d51cfab9b78bad80f7f64b2bb00f5c9495e3919fed632ac320a678d8bec7e95' 
  AND token = 'gDhYepQXvS+F8+fqSnI9dAM3Oe0wiAFX4JelksArjM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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