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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9095805b222740f9d8da64308bf0002819b0d4c4714c90070c426440300df3' 
  AND token = 'rYH2yzlL/6aYoXnRvbXw6STMfYP9/lZ0ZF7+9XqupGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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