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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8becbffcdbd18c450a6a33628eeab9f5be0c2fd85090c1781746822c0d42da1' 
  AND token = 'lskhaOs2KDXSuOMwVztVf0AE/FEObRbEc/JmdW4njMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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