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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66af7ca26038a29c34617527d8e48c05364bf5fc7d904bd634fdb4d4718f7b2' 
  AND token = '08binpwLiJN0c1vHiLF/can6YHp83BE6eVYX3bxs4fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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