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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '161b6ccddae9ae9e09565351bb5f8230c409cb4bf3152d2aee6a73bf09fdcb55' 
  AND token = 'Lwvfzn+rQprlfMmKChAtSkS0tw15u7IK5+0CL8An110=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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