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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201964c7c9ae3a0434cea8ab1e8ea204c17e4eb0c0fa3373bcbecc43d8554ff9' 
  AND token = 'JEHCxJtG83E2xO1pQFWZipjtupPmrHEXVau73+jnrPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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