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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49a2fa75a3e3415a0629baa6f498fe5cd519de0fc4c4b7bf8f0ccbb600acfc8c' 
  AND token = '6vYVTWMJvbPKCATmo+61DwR9rXrJ/lIA51xX0b2KCl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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