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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59d0c8fa5995d9590edb80efa3e36254fc6e2f6e1ed89be7c00f60c98932205' 
  AND token = 'TlK91tsCPTgMteKwMjbfa29CWXxhHT1Xh0G9XYzvTgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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