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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea739fa59449b6caa2027b84ca6fef8088a46d0d25b69e68210908d4333cd5c' 
  AND token = '5La6o+v0F50KFPD8z306BPsRolN/wZ/mLxLac8YRFbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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