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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7201b7e649770341bbb60c08b8e8c68843c2e626af2eab4d8cc1747eb3b377' 
  AND token = '54oZ/eZdZU4hvKOXCRhjXHhkq8t41VVcczNArYbOwEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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