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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d691d3eb63c018f20cb48e0bb8efc0e48b7d31a7b1cb77e26dd190d89c0a870' 
  AND token = 'n5RRn01TNc2uZFTbEZqZvrR0ragSeGi3oAIi0+wWFp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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