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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23b2717db6c27cbca66eb314fac71f7e48afe0947be22024beb6702dc05705c' 
  AND token = 'OBx7lxTZS8yldXettWHsf/1pkeIyYFOD8QHRjW4ADS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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