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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95d5abb491d7c0e0bcd9269191944093906426323889080839a117c8a6011cb' 
  AND token = 'Fz6iFXjhYJQCtWyd8VA2abvtg+evYUrO8KVjYwA/vpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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