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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba562c98452a4ee612b03cd76f90726a2c50d170c77e71135f88406056a1d82' 
  AND token = 'yt1Snpm7bQK/D+vj3Da7TjabxXAMM5FZrbKZbzrZcis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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