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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c538d4ac233cd24ecce3a69870184808b138b15a42b2571cbed2da830e9c494' 
  AND token = '9Q9igE9DNfBk/U5lNeYglYFd2R6m5TxrkG99aBpqWow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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