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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8544704239894d7a603a231f489abd21257ae1ca9853f2cdaa43ddc9cb46f212' 
  AND token = 'rovPKyOtbLQOZn4sSiW4x1P3Xxor2rlvSVtEVEwmAoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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