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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd72e0fa735be8cf488b3c57f8ec0afb64636b0f69b39f89cd4c203ce5675cac' 
  AND token = 'hYtEJaoWJUmnWWDQRXnLcB0kwWzp3aLQstw71XBmBM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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