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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ec6f24bdbfeb183d13cd48744470035b57bdc6147b1e18508de6c23242a5d3' 
  AND token = '01NxH9n/XV6eSqqCuECh3xQHiOcwMgBrMtKlY019TAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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