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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5f02afd993bd7997cd074850585bd86ed2e5c625ae1a089f903efdbe8334fd' 
  AND token = '9HE9X5wBc/cumShvi3JJ3Tok1+mDqGzaPehplpp0Qr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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