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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaeb7e3fb9faffd7b29b3443e78d20cfc19bbdec849fc1fd1e9e73d7c4f67f6' 
  AND token = 'SuZ+ZEek+n0E5dEKkqnQ+8wJg2qprf4S2P5smNp1GeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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