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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90932e2411d16edc9d832990f98454aa3829e28a3754cdea9fc5aa40be46bcad' 
  AND token = 'NARDf2Rv+ISNewTtlYsgPmLhr1FVUr8LcaqVhG0WJBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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