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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6877f3a5b5d1bded366a7c6e52a7b728140f4c4416ab4c57ade6f6433f1525be' 
  AND token = '1fwl9VdBHzOBOf5BMFcWxNz3x4C7ektJTqccD6ZSnvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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