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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3669975b4e49f6c2e82dad074ee744a8e01b947f4a4201b9ac13642d066918e' 
  AND token = 'URKquVVF3hcdXWQOHib0MFMC9G96YSqlo+gNxuDeLIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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