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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e861140934201f316ca7c42c7119c2aab58cbf690d061c6248f9a95124a2dc6' 
  AND token = 'lBogtwjozZbXmE9Bdx7YhGVipOSzRxgEP2cjkihpfoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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