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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd790b1f5bb018cf13d0960a4eb294971abc1828b31906b2cbf004fdfa8d13b2' 
  AND token = 'p7fSyecAoTP5z4edSdrkX6UU83hO6tXCICljoYYf+xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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