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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd90bdbd2e1dbadb75544d3734f47eb6d5e87d08ef0741b9894c86b70ee5905' 
  AND token = 'SbvsCLOREoDm0DYPKUdzrPmYaW+JQVGD+Vqk+igoaUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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