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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1360213454b29e1996181ca230c3039a66f23df428c0753f859ecbedbf80334' 
  AND token = 'qBSapfQFE2jyyyI3DI+sSlvp9zvurplpZ8wBv2YukhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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