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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c02ed6fa9c31ad9fc5837e16571d33e4102a69df690140b4a469eadee4316f' 
  AND token = 'O3DSVPk1NLbZI5mCqnWORyzxLADU4ASJijRMM5StJxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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