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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f262832383301d46c029a44a1cc30b7a1ed08a689e0701ebdce538bb770da87' 
  AND token = '47rNN3WnGDanS/b4SLGhjMpfRkVHa8DTJUgx0g+pxuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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