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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f14ca03f2e9eff4e67aa20e06001e0f14084487fee4cb4c105d3c700238a7b' 
  AND token = 'M5yqWglmE63gEYv84UmPe4w3PB/kMzumbfP4/W0P0So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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