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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5cca35ee54e6d171ef1ceaf3942410815e586766424bd079d0391eb1c13ae6' 
  AND token = '2QcNdqZcf1DH6aBCxacHojGjiRo1jdbaXncwu4bxPhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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