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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c212b1c7702a53e543518aa043bfc6ca876008f2878483c7a1b130594f816cf' 
  AND token = 'PHQi9G36DKXGXtsMPWJEUq8eMXjcQg19WLNmut0EI0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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