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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ae8615a06fa612c2ef4185fd676c91c3db24c0dd73388697811d1c3e2de85e' 
  AND token = 'wpg4Lvr54822ZuEx/ke/ouqZ7DhnkirFb+RePaB1yeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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