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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f19a361d7e8f84d1034cd552403792cbd94a91bc0a336ec6c13e5eee8645c2d' 
  AND token = 'ZFqfwoMz8K7dnoMFthiJAhX7IcVAdVrQ1KS5dL41bc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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