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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254fe945756b574d5d62a0b3fe91a466a2079d8928962f77736ea6c863816db4' 
  AND token = 'DqCg3DK8rrlvrAbbzFbIvK5VJli/Djji2txNsb6/cWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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