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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874eb7180b07e77e186ed48b7004410297c5894579f80bea055ed292ab4e04ff' 
  AND token = 'kpYdQo4AHFL6ono9AG1kEZEKNaK8M4//MmDyAgW9c1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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