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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc547f004e5bfa82348c053b62c6b469ed725f4abc8a343485cab6fb47fee57b' 
  AND token = 'CI33hk0D4+PxS4UBk+moQo7VmjjHZUKLfPkEWwKksn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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