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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb3d72888971d3509ee34b639dd1838199677be8368b5bfdb55c39bfa176715' 
  AND token = 'ixDU3femJPTBflOs9x2kV8BITfMC3DhH+vWO1psZzmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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