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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c57abb12638fa528551619f50d9eebbeec41031650377a60d32591c26606bc' 
  AND token = 'm666FvryHyGw9FDEa02z6gr/U77mlwuJMsCFKxIVJVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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