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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0527b402d61f974b850687cf4dca50dd2b2cccf227d44ee133a912d56acb8d' 
  AND token = '1l8MuEcxgWB2QE3kosJ5+X663dNwftLUpruMJhRLfiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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