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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1bbc35e64585571ebc6fe18d856508c4edfa1a351089d4af83de529f5816cb' 
  AND token = 'TgcIKRr3iUERaDsYHMm1dYYtzYgTtKICWgKkS5mQUug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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