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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b2d34441c2a0b6def70b228f93a31522b18ed610c9179d10c8e5328a39a44e' 
  AND token = 'SC47MNUH84f4kPMNZu+ikrig4Ob6j+G8tqmTFZR0+eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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