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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b978c30265b8f00b525c853466c23ac7f363356f301c5f5ec2cfb175185018a' 
  AND token = 'Mmml5u/OVXiI/Dqlajh0lhE8HM9soe4a7ycX2vXGtvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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