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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0906464253ffbc2c04f8cdc596760df297f3a691e4888cb85ebc22650284414' 
  AND token = 'MMg9/Q+fbKYjjeAH3W74QAemkOwke8J5Q+tc+sjQLms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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