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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95d656b6b4bb73200f418d5261ab293f8aef6fbe0b418f7f77df315b90b1eed' 
  AND token = 'DuSG4QKu4zlX9QyJyQLq16frRMucCg3T0CphfnxnYoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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