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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3957d6fdc61b37dcb40c4a31db90e98f7e4722a6b6702a54c4af6bf2069c0e23' 
  AND token = 'KRRau2u8ncUeLHpvy6g7d5HUPoi3zFLrHk1vIr37nlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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