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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bf9ff0dca1b6113e93356ca930120bdddb52a0f86a61c8efc81847f1116f59' 
  AND token = '4NzBBimEUm20g8iBNlYUqkSbXea8OjK7C7FYLlr+OQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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