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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e31645a6833acce9574d9ee9e69862ab82ac1ea990203bc104793fd48b152b7' 
  AND token = 'n21ERivtIaPX8pLOGxhS7vzE7orORgYP9XRDy8R1aik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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