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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393cc6a7dafe9ce5c831f3164fd76ab43ffac7b6fbe7241a30d5261b8ec8a2ee' 
  AND token = 'JhlbOsCzw1D6b2+EkohrK1IPPxxiax9pwm8E9tmymAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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